The Effect of Contact Lens-spectacle Reversed Galilean Telescope on the Visual Field of Patients with Open-angle Glaucoma.

Mohammadreza Moniritilaki,Asieh Ehsaei,Maryam Badakhsh,Ramin Daneshvar

doi:10.18502/jovr.v15i4.7779

Abstract

PurposeGlaucoma causes irreversible visual field defects. This study aims to evaluate the effect of a reversed Galilean telescope on the visual field of patients with open-angle glaucoma.Methods Fifty-two glaucoma patients with a restricted visual field were recruited for this study. Central 30° visual field measurements were performed using a Humphrey visual field analyzer before and after applying the reversed Galilean telescope. To be more cosmetically acceptable, a combination of contact lens–spectacle was used as the reversed Galilean telescope.ResultsOur data analysis showed that the reversed Galilean telescope had a significant effect on all measured perimetric indices. Visual field index (VFI) improved from a basic value of 44.38 26.96 to 49.30 29.83 percent by using the reversed telescope (P 0.001). Moreover, the mean deviation (MD) was significantly improved from the initial value of –19.91 7.19 dB to a value of –18.69 7.73 dB (P 0.001). However, our results showed a significant reduction in the pattern standard deviation (PSD) comparing before (9.83 2.82) and after (8.51 3.30) values using the reversed Galilean telescope (P 0.001).ConclusionThe contact lens–spectacle combination reversed Galilean telescope significantly improved the central 30° visual field of glaucoma patients with the restricted visual field.

Highlights

We evaluated the hypothesis that using a reversed Galilean telescope can improve the visual field of advanced glaucoma cases
We found that using the reversed Galilean telescope leads to a visual field improvement in central 30° of glaucomatous participants
We used the standard automated perimetry to quantify visual field changes after the administration of this device. This method leads to significant increments in the Visual field index (VFI) and mean deviation (MD), denoting visual filed improvement

Summary

Introduction

Optical enhancement of restricted visual field in patients with visual field defects is a major concern. Effect of a Reverse Galilean Telescope on Visual Fields; Moniritilaki et al of practitioners.[1] Reversed telescopic lenses have been widely used as field expanding devices to help patients with severely constricted visual filed in low vision clinics.[1,2,3]

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